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I've been an instructor for over 18 years and have been doing pre-post test results for over 8 years. An instructor is most likely concerned with improvements between the pre-test and the post-test, and any other demographical data (how many took one or both etc.) would be of secondary interest. Here is a simple chart that I use when I explain the importance ...


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"We want to show the improvements in the students who have pre- and post-test data." If that is the ultimate aim of this graph, to show the difference over two tests, then there's no point in graphically showing those who've taken only one part of the test or none of the tests - these can be summarised in a corner/outside the chart with some text (i.e. not ...


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The best tip about designing graphs that I can provide is to have a very and simple message that you can see from looking at the visual representation of the data, otherwise it defeats the purpose of clarity in communication and becomes a visual design exercise. Having too much information often means you have to look at other graphs anyway because it is ...


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The problem is that you have to fit 3 series of data within one simple chart. I would suggest something along these lines: You display the number of participants as bars, but the success rate is the filling of a bar. Also you may check ds3.js. They have lot's of ideas on visual representation of complex data.



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